Gas-producer.



N. LA TTA. GAS PRODUCER. APPLICATION FILED KAY 15, 1911.

Pa; anted Nov. 14, 1911 Ff a. 1. Win/E8858:

ZXM .//M M WM W A TTORNEY NISBET LATTA, F CORLISS, WISCONSIN.

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Specification of Letters Patent. Patented N 14, 1911,

Applieationfiled May 15, 1911. Serial No. 627,260.

To all whom it may concern:

Be it known that I, NISBET LATIA, a citizen of the United States, and a resident of Corliss, State of Wisconsin, have invented certain new and, useful Improvements in. Gas-Producers, of which the following is a full, clear, and exact description.

My invention relates to an improvement in the grate structure of gas producers.

Gas producer grates are required to carry a fuel bed of comparatively great depth far deeper than that ever carried by the grates of heating furnaces-for which reason they present peculiar and serious difliculties. An extremely serviceable form of grate for gas producer purposes has been practiced, consisting of two horizontally disposed tiers of grate bars, the members of which are sta gered between each other and so constructe and disposed that the lower tier maintains the ash at the angle of repose, while the upper tier has flat sloping sides, between which the ash falls upon the lower tier. This grate has one serious disadvantage, to wit: The flat sloping sides of the upper bar are opposed to each other at an angle, and the bases of the ash-arch between any two of the bars are planted more or less squarely against the fiat sides. The thrust of the arch is thus fairly encountered and the arch preserved. This arch eventually becomes quite compact and prevents the flow of the ash, thereby disturbing the effective operation of the grate.

The object of my invention is to overcome this disadvantage and I effect this by so forming the mem ers of the upper tier of bars that the bases of the ash-arch are caused to bear on surfaces oblique to the thrust of the arch, so that the tendency is for the bases of the arch to slip or slide readily by and off these bars and, therefore, the arch is caused to crumble in its inception. This insures the stead flow of ash to the members of the lower tier, and places the discharge of the ash completely under the control of the operator, who has then only to disturb the angle of repose on the lower tier to cause the ash to flow from the grate to any extent desired. Preferably the upper bars are formed with curved or rounding sides, though modifications of this may be resorted to so long as the essential principle herein expressed is retained.

The accompanying drawing s represent, as

an example, the preferred embodimentof the invention.

In this drawing-Figure 1 is a fragmentary section of a gas producer equipped with my invention, and Fig. 2 is an enlarged or detailed fragmentary section of the grate.

The gas producer may be of any ofthe standard types, either updraf' or downdraft.

In the drawings cl indicatss the shell of the iproducer and 6 may reprr sent either the dra. t current inlet pipe or he gas outlet, according as the producer is of the up or down draft type.

a indicates the members of the lower tier of grate bars which are disp used in a horizont al plane and spaced frcm each other. The upper surfaces of the we bars a are formed flat, or are OthGIWlSt so shaped or constructed that they will :etain' the ash in piles on the angle of repos 6 indicates the members of the upper tier of bars, which are here sh mm as round pipes. If they are hollow, as illustrated, advantage may be taken of thi 1 to water-cool them. The bars I) are stagg :red above the.

bars a over the spaces betv een the lower bars, and the bars of both ti irs are so proportioned and distanced frr In each other that the ash will flow easil 7 between the upper bars and will fall from the same along the angle of repose, to wt ich angle the edges of the bars a are coir cident, retaining the ash in the manner ill lstrated in the drawings.

It will, therefore, be seen that I have arranged the uppcr bars so that their surfaces are presented obliquely to th thrust of the ash-arch between the bars, :nd, therefore, the bases of the arch are depri ved of stability and the arch must fall. W1en ash is removed from the lower bars, the ash is deprived of its support and drifts read: ly down, forming a new pile on the lower bars, again at the angle of repose. According to this, for cleanin the grate and dischz rging the ash, it is on y necessary to provi [e openings in the shell d, which openings at e indicated by the broken lines c, so that pol :e bars may be inserted just above the plan of the lower tier of bars a, through the me lium of which poke bars the ash resting on the lower tier of grate bars may be thrown I fi", thus breaking the angle of repose and a] lowing the ash to fall from above.

, Copies at this patent" may be obtained for Having thus described myinvention, what i I claim as new and desire to secure by Letters Patent is:

1. A as producer having a grate composed 0 two tiers of bars horizontally arranged one above the other, the bars of each of said tiers being spaced from each other and the bars of the lower tier arranged op-' posite the spaces between the bars of the upper tier and provided with surfaces capable of carrying the ash in piles on the angle of repose and the bars of the upper tier having curved cross sectional contour at all polnts exposed to the weight of the producer contents, whereby the bases of the ash-arch between any two of the bars of the upper tier bear on surfaces disposed obliquely to the thrust of the arch, and the arch is thus deprived of stability and caused to fall.

2. A as producer having a grate composed 0 two tiers of bars horizontally arranged one above the other, the bars of each of said tiers being spaced from each other and the bars of the lower tier arranged 0p- Washingt posite the spaces between the bars of the 1 upper tier and provided with surfaces capable of carrying the ash in piles on the angle of repose and the bars of the upper tier havin curved cross sectional contour at all polnts exposed to the weight of the producer contents, whereby the bases of the ash-arch between any two of the bars of the upper tier bear on surfaces disposed obliquely to the thrust of the arch, and the arch is thus deprived of stability and caused to fall, and

NISBET LATTA.

Witnesses:

E. T. ADAMS, W. P. MARR.

five cents each, by addressing the Commissioner of Patents on, D. 0. 

